Light Test

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Light Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

The 'pupil' in human eye can be dilated by:

A
retina

B
choroid

C
optic nerve

D
iris

Solution

Iris is a tissue inside the eye that has a hole in the centre called the pupil. Iris contains muscles that allow the pupil to become larger (dilate) and smaller (constrict). The iris regulates the amount of light that enters your eye by adjusting the size of the pupil opening.

In bright light, the iris closes and makes the pupil opening smaller to restrict the amount of light that enters your eye. While in dim light, the iris opens or dilates and makes the pupil opening larger to increase the amount of light that enters your eye.
Question 2
1 / -0

An ideal mirror:

A
absorbs all the amount of light incident on it

B
refracts all the light

C
reflects all the light

D
none of the above

Solution

Ideal mirrors are mirrors that reflect all the light rays falling on them and don't absorb any light.
Question 3
1 / -0

Fill in the blank:
________ are used in periscopes to reflect light.

A
Concave mirrors

B
Convex mirrors

C
Plane mirrors

D
Convex lenses

Solution

A periscope is defined as an instrument used for observing over, around, or through an obstacle or object which is prevented by a direct line of sight.
Plane mirrors are used in periscopes to reflect light.
Question 4
1 / -0

In a periscope, the reflecting mirrors will be:

A
Perpendicular to each other

B
Parallel to each other

C
At an angle of $$45^{\circ}$$

D
At an angle of $$60^{\circ}$$

Solution

In a periscope, the reflecting mirrors are parallel to each other. And each of the mirrors makes an angle of $$45^{\circ}$$ with respect to the periscope tube.
Question 5
1 / -0

Which of the following describes the process occurring in the figure (a) ?

A
Refraction

B
Diffuse reflection

C
Regular reflection

D
Total internal reflection

Solution

Figure (a) describes the process occurring regular reflection because, for a parallel beam of light, all the reflected rays are also parallel after reflection.
Question 6
1 / -0

Which of the following is a non-luminous body ?

A
Sun

B
Moon

C
Candle flame

D
Electric lamp

Solution

Moon does not emit its own light, it only reflects the light incident on it from the Sun. So, Moon is a non-luminous body.
Question 7
1 / -0

Fill in the blank:

Plane mirrors are arranged _______ to each other to get infinite number of images.

A
perpendicular

B
at $$45^0$$

C
parallel

D
at $$30^0$$

Solution

no of images formed(n) by to plane mirror is $$n=(\frac{360}{\theta}-1)$$
if plane mirror are arranged parallel to each other$$\theta=0^0 ; n=\frac{360}{0}-1=\infty$$
hence,Plane mirror are arranged parallel to each other to get a large number of reflected images.
Question 8
1 / -0

Dispersion of white light into its constituent colours occurs during :

A
Reflection at a plane mirror

B
Reflection at a concave mirror

C
Internal reflection inside a spherical drop of water

D
Refraction at the boundary of a transparent medium

Solution

Answer is D.

The spectral colors of the rainbow are caused by dispersive refraction. Newton established that refraction causes the dispersion of light into its constituent colours. He named seven colors, in symmetry with the seven distinct notes in the Western musical scale.
Refraction is the bending of a light as it crosses the boundary into a different medium and it is determined by its refractive index, or how much the light is slowed down in the new medium.
Hence, dispersion of white light into its constituent colors occurs during refraction at the boundary of a transparent medium.
Question 9
1 / -0

Which of the following is employed to clearly view objects which cannot be seen directly due to obstruction?

A
A laser

B
A periscope

C
A kaleidoscope

D
A sting ray

Solution

A periscope is device with arrangement of two plane mirror such that we can see above the obstruction.
Question 10
1 / -0

The cells in the retina that are able to distinguish between different colours are :

A
Rod shaped

B
Cone-shaped

C
Cuboid shaped

D
Long and flat

Solution

Cone cells, or cones, are one of three types of photoreceptor cells in the retina of mammalian eyes(e.g. the human eye). They are responsible for color vision and they function best in relatively bright light.

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Re-Attempt Weekly Quiz Competition

Light Test - 13

Result

Light Test - 13

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SHARING IS CARING

Question 1

retina

choroid

optic nerve

iris

Solution

Question 2

absorbs all the amount of light incident on it

refracts all the light

reflects all the light

none of the above

Solution

Question 3

Concave mirrors

Convex mirrors

Plane mirrors

Convex lenses

Solution

Question 4

Perpendicular to each other

Parallel to each other

At an angle of $$45^{\circ}$$

At an angle of $$60^{\circ}$$

Solution

Question 5

Refraction

Diffuse reflection

Regular reflection

Total internal reflection

Solution

Question 6

Sun

Moon

Candle flame

Electric lamp

Solution

Question 7

perpendicular

at $$45^0$$

parallel

at $$30^0$$

Solution

Question 8

Reflection at a plane mirror

Reflection at a concave mirror

Internal reflection inside a spherical drop of water

Refraction at the boundary of a transparent medium

Solution

Question 9

A laser

A periscope

A kaleidoscope

A sting ray

Solution

Question 10

Rod shaped

Cone-shaped

Cuboid shaped

Long and flat

Solution

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